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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bfe411224a58a172a702846926fee1a8266b80cb658ccea797af69403d215ef6' 
  AND token = 'c7+qo+oLxHEtX5tGr5nDISFAIk65h50ibBARMgbgH/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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