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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '94eaa4d21f220cfa46270090a5841b4414ba22ae026e15ea3a68155db0caf1f6' 
  AND token = 'IcjG1l5y62oDo+hhw2p64cjNi2VlwIxmvrRtlqRc4yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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