Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d117a47e1b6b6304bbc780ddb403d0ec11031842f204e1868e1497be64fb7d' 
  AND token = '1u6Fp/3nYEZRRG7avLc/QBVdKIdq3jNJaLjvt3P8eEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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