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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '525e9a60dd44d6719ad1cf050ee2907cdd2fa46cd598b7808a3f7b8cc3d7354e' 
  AND token = 'RWeFhIyyo2GKc+sgyxcMVIEthCKtdj6oOdsaKP6Q7ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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