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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2e1393925e5e332504e6c9240eadf2f80cab9d4faaa9de154a85d749a4e42515' 
  AND token = 'aXgbybdC8iIuTtdBXQq0ZgX1n4bxN7ts+z0obgjDXh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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