Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3defb3823af2e8d1dc8f3a5b45ad05fb136551183e51f1c8aae77c0d9950383' 
  AND token = 'AX3bZKCu/R4ZWTzVz/9YNuw8QI/Qx1GwQcstiZLMgeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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