Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d8cd1c9768d1877a41b5ebc39ec9618e0293f9c364a727f69380d048b39168' 
  AND token = 'U8ZW7/gRpzgt+vgGQyltrsZATPxotTXnx0Kllx3miSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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