SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd064b9d770e9c2a3902ce5bd14722de1cb6bbea64f2d9922da3e718f1ca86f34' 
  AND token = 'VWUYD/Fi226pPKQrO0F8hYEFqCwq4HSjialZBizbf8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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