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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7a159f1c924376b0df3f82af56b0807fd416611dae9879f9eefa713ae464e18e' 
  AND token = 'dupAaLUsRtJ0w2WHPdo5vQUkYcEx1aIfiOulZlCxXSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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