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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4223ee196af3cb9f69c880875ed7fd6d1dcfbf846c03d7a02bec0d7dade689a8' 
  AND token = 'CqO61xB9QczfsL732NxlxLrNTG3Pqip98p5Tfgo7KJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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