Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8206e86780afc189e87ab96f120032fac35e4f3ed7ff043677e54b06f9af5e26' 
  AND token = '2l6wHZFR6Akl+QYafYGowLicmIorgPtEmhigYYMe3SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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