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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4d90a3c34770e88fa5c78a93ec1bbfa3386b407e942a113e304508e0118645b0' 
  AND token = 'tgxSc01Ngf+YCZiNZxB3rUk/YfjN2qFa8YihfI5KZRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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