Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91120d49e15ece0b9a268ef6d6d5049d470edf23fc1052d6398fa53f0e2f7b6b' 
  AND token = 'rkvlKWISHv+pRDDSqc+RVoem+QCM/cYH9CCHrnW5BYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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