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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'baa9ee72b700ae25e78088cbc2f831fcc396de852faf6df677d378c566c6f2a1' 
  AND token = 'T+InLOPmKpty3Rpkief2Cd7FTLTUo2+AgoKqWkZUdpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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