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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eaa7f86efd62401c5ddfaa045844080d83a63ced0284beedce8257e98e8b699f' 
  AND token = 'oHNmZo7MopCh5LjAZQDOfQu49hKunXEyPTlu/+IJlZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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