Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f803ca3a3ca7ac6835195a45bcdd0ab257b86b837c1e4f2a725960eb9b262b97' 
  AND token = 'l+2eLD6zTSKMh2nI2XHe7bqEyOG5vW/FRo/VlPIWRCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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