Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9ddd6b338c889befb86b6e40613b3d4af9b892fed06d02cf29bd8f3a455d40' 
  AND token = 'hmb4lZL8QEqjAPlbJnfxvXxYRVfwGYnsOT8VkNdlufs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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