SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '61bb128a260d15a585bc4da7a606c3cd30f32145956bb7c13dafce3fc4d395ac' 
  AND token = 'lQZ4dMajDVUChlRWozg/IEQwVVkYv2F/2XQ2jKnX14Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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