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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '57a0f271da575af2a4f20be9d0e4a9b0e72683ef669d04db1560cbf1396cf615' 
  AND token = 'aj46cWnrl0bfhNcBDFabKbod2OC7c/QR2GDGN+jWvvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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