Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db72958bc3743f8ce5f5ca7ffe5cbd275af5b056118f0d3698f8e5b11902393d' 
  AND token = 'LmmOIXenCQSGmpNiWLpoNCZdzNy+2y6uuD6zn6dV7oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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