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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c60e37f11817f9ac48daa10523054ef1835093d5c51e3e99076ceb7fbcbe81ab' 
  AND token = 'XvR4DgXMbRQ33It563iAHlLKxtMqBGFfxW7zqbIH06I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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