Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4217364250bbf7d1442d5597b8b6dc4013172cfeca5153f8616bd842d601cb2' 
  AND token = 'NqRTootvGF/7WYCjIPDrF20fK87bdeKbIG8SnFgcDuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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