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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7819f335ceeca298bc35396d9ec576e2a56268e92c50a71823034220151beaa3' 
  AND token = 'Z1rIFk70wAEUa2cmFFi1ABPLz/Jtsy9Lbhhq4ZXIUcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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