Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d0f68bb8feec3c929930cf33182584a184697a5a2845237858e98a71e4e1b9' 
  AND token = 'KouVlCJbCHH39HvvEnV3WUcbRkPzqpEaGhmlCaifsv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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