Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970bee0903d7f2f00e499f5f7b3e49c4a344ec6e426fb598024a14a25fe9ffe3' 
  AND token = 'gaHFG2NraRIOfhA2sVm6IP0DYmRHRbZ0yi4F+tyQ6Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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