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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3e18c84da394c28bc456643c20b8a2ab8166a1b03dd100988058d10504c4ba79' 
  AND token = '+D5VBQh2s9MhE2pts/iW0modknn1kj3f0hGt44s1WAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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