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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ad520e51864df23166d0d6c51c3fc7c95ffa56ef40edacde8e5b83693e4d3c14' 
  AND token = 'Ol2CJ7lkrI7SAJKXezYvMzc4kNqYrPf3z7oLB/IzXGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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