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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dbd70819aed0c8a66bfb0995c223b4563c453f59b70a2e6e1bcfa1d6d032d63b' 
  AND token = 'HSX0sgMWZni4HJ5LNZ9LYGjpjsv+o0b6c96/86jGkyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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