Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0395f73af49511ae1bf9cdf3df2205730d40b811b08cf05c22017b0b3767bc' 
  AND token = 'i6mvOvaW14IlR5dZ1CPFwsIAzq9Ne0gBittzNLiBEA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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