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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a28dbb3b71b4f411c87962cc8f92982e868fa9ee17df2ae05c78b4db7609d94b' 
  AND token = 'GzWbIzJhW4opiD3a6puOwy0awFz9B9D67fx7Zn51NQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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