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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6d97f02368ce544aa71081c6eb3ea910547b4c203e928448e879e8ca62aee3ec' 
  AND token = 'yhoSeJfkESWivQrAhsKYKYj/FLKgrl1sLYoyF57/bUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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