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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '65a5cf0e85d7098e837849a995efe0e3bad1356ee9f45c8557cdce9ff6e1541b' 
  AND token = '+jrZw2sGC5BPjzFRrsdb47+CS+3WIzHkYKveb+ym67A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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