Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '52cc27ebaeeb4ee117f3a82c5884a489d38e83594b1fc76536ab62fd53cd5b9d' 
  AND token = 'BhaEMkYZAccclRIGBxdkoL8hJ9rtCjqdhghdS8YpUF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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