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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '56d48baffa86cc649ea0ff535360f833c789d8343d57c4b269aa95165c504e7e' 
  AND token = 'ggV8VJol7EcZoOvIumSbsK54TV/9q87IU1tEYv0bOUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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