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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '35f37de0c3cc0d17c17ab2d547723a06bf577590dd184243e9e68e8d8fb3bc46' 
  AND token = 'jzy4etpPQqad6u1adXzdyXypzLWD8mm0nwqEyqQZ8X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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