Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e450f73e6017a9266a3ac5405de91f200c4b8423074afaa290aadbfcb19b934' 
  AND token = 'QJnQedfcIoSGucOILvwvhH7xRyDp5bZ6ofkWZfzu99Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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