Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1fbf431562c09a85a1daf21ee3f85822b8aca9c67c8a83f3f07b43bb5442d7b' 
  AND token = 'o0KsYmoUImjZEaGPozP/M/qXL88I5v5vWDZ5rGomtr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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