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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f380323e1bb0ff9dc7341489b048099645d815b141d5a3717f316c1a98e385fa' 
  AND token = 'buub9Hje5Tl11xrN0DF+WQk2CZGvp7uIZcsAq4yNw20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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