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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '854964776adad36774aa24ef81addd117574324d2095c930e75a78b79d2c4c7b' 
  AND token = 'QPhY7KM6CQNagzMkHN3vtns59ZuCMa8eqOgF67pFJQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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