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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd61e7856ac829a7c6c691063b5fed0fcb7a6ba8eb7dafe91b3403166ba043268' 
  AND token = 'Fdfzbt69rc40lDT7eZ+YX1BagqOJjc8Jv12oX1ywuKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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