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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ad5d2ae587acf729e7590209f7df91ebc03e23032dded3f4ac2d993eeeb1eded' 
  AND token = 'r59SpjiRBleMXEu6IZNuKyelT4ghqGFcWmF6JqRq8gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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