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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c404b7c259cd0c695eddc47664cd6914617d269ac66b9c049b6f7ab37a85e2cb' 
  AND token = 'hF6sk7OIsvptrLkTDHJDNHbZcwIuD5Dr3Wq3capUs8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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