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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '615ac4c3c9d6cb0740eb630ceb58a854151132140634deb525b30defef3a51fb' 
  AND token = 'qDx3dt35hm1jbdsdiz3UeG7GCa2Q5gN3NS9avQphHU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}