Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6a4203f119cd327802afae02c4a9ba483e9e1313bf25b782e18cb1c7f0ec3df' 
  AND token = 'RhJ48JGsWQGeqIIoLnJO6mqDakmnHPkYvwwWNGmlomw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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