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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6cb2cdcf3b66331e087d3c54132e102a5f4af937f86f6a3d51afe7b16059d248' 
  AND token = '+dogJL+3QX8EvtiyyjOnm6xBielNic9Uo7CUZ7sOuf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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