Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b290124713134e88ff5d205152da6dcc8bd73f201948ef2f6084d6efd29f2d21' 
  AND token = '2j5hwJCBYKD9Fq2QU21wb6X0QECOyz+Lk7ZQXE3sFKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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