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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2ad97060db7a6564ee389f74e82fdae62ec5940efa269fa6cbde3af78b1399da' 
  AND token = 'yKvQG6lLdd8s9l7pAK2mnaJ16IsDY1x9YdjixfJx/XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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