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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c031bb97722051069b2a6c0f2369ccc4bf28ecf22e1c93876e868595cd63da32' 
  AND token = 'AA5qietmLZuOZw8HUd0l8e5m1ofvXJ2XDgyL/KUr8PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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