SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '871608f78bbc75d6431a317853fd6f0e9d9ea06c6b27a3f16d0527742a99a01e' 
  AND token = 'MC7dzrVGwUTX/Qi/gzrVaUX5PQF6T56k1IRBxKtnILk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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