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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '89b33fb0cd3f2c4d1b9b50cf8e8a2b25fdace22bce0f322b38da2a4f1b448d9f' 
  AND token = '/3zA724CiYJC+RqZ3pvfPatSUx/s2N7jw20wlQW64Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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