Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b3ce0be65c1b0d90d426dfc1250c357a07231963e79b7f5e8290c73fa1f42c' 
  AND token = '1O9myRlavRItMLSSiXhSv7MOy4a+2293xdpfSfPBdnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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