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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '02e08eafc1576f3056e1f0fcba6039c443493ad1168e064cd17d73b0b1077a12' 
  AND token = 'aV8XcssRg+jVers9NmFdFhbUFfBqKEHhAAERCtC1TiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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