Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b51513b937e0949693482d90f9e0915eeecf008efb85d003de3dabd40edcf0' 
  AND token = 'H3/zALtES9JBRjUh7qr7DFLIHVOyBLfDRggoea80AIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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