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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3b23cc21d33c69b4029710344db23de4b024c3028b91b44d3ad33bf6ae9cb288' 
  AND token = 'EnkbvJXoHlegLUkhalWclRBS4+ETko+phJMJFdJVY70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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