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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '74fc2647ce492a3b7e2dfafcb15c138d5252e30a61344ca8dc3163996612cb84' 
  AND token = 'o/3QUKBR5NqaY0YLbcrrmuzKxIwKAaFF4DLq01fSVnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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