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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5ed43d998fa83e5f999285f66f7a22dfb15c95d47a79749dde5d778af85a226f' 
  AND token = 'ZxV0CjxXFn/jdw6DsuzBlQ7SnXc+Wa+3F+iwi4XARq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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