Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd543eb66c809d7478f10fcf9057a2a1adf97238ee66c1e54cd6e45ad15e0e38e' 
  AND token = 'Kx9ayfkN7h8zlqhh9PUpSssGtErZ+X2BU6YkxzhArOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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