Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e63d0d2a5caa9f128ecedb5dbfbd18227ebd8ad7f95cb4d1c0986ee50fe56b7' 
  AND token = 'r7EdmtQDkgSBVZdEyTJz+3WSPeuTRNNmUxWqXfFfXmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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