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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f87b005d75a082804ef26e64e4ead6baf625f13efc857a4f28e901317e190e09' 
  AND token = 'luG/8cG5ZIl/sojh0LQdU8eobJWLtFVZt8P65nUXF4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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