Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '93373b0a7d31a36a0bf3a774d3750d606a70c0a9b0d5820de9c3a2d2b1142475' 
  AND token = 'NFq2i00raU7e5DjhKpR78im4LSpJb3Ro6JU5HEBo8+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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