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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6dc004cc241e97b3ad132ec98914d1006c4efa30d107248cb70b8723a8a0034b' 
  AND token = 'Dr/y/dBGEqgHEfGqZk8053SRzCfqpPqvcRK62hTbsoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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