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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'c7706b5ee25e51192682dbddf49836dedec04fb6c0581fc211980cfd629537ba' 
  AND token = '6v/uSQ2WZIwZxcICEnlrtN6qpw3f/ZFUxoHxeHN4E4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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