Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c12b3da9f20e3f7d3662c3c341b9a79b59f8ef7f5bc671a9032c4dd23fe631fa' 
  AND token = 'D1+QITrc4tvJuWIE4vZDt/SA9JSL8ku8anhb2bb1fDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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