SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ff9da066403dc82baf9a17fb88c58b650c44264b6e5527cc99d85cf1620e1958' 
  AND token = 'fOwLC7fHX9mkTvNnAiH7oGEm+WWyniqB6QyTxocyvKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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