Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '103a0e35c3a39b5564090eda2502ee6845e3c17f7f0850ae224541e0ae6fd544' 
  AND token = 'mFV5urM5W8FPJ65hzqe0FOGTkeL9t4isIIoheY91H4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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