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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '946a4d7ae058836e38b5283f340202b8ef1e5363e005816b4c911414624084cd' 
  AND token = 'BOiqwYUa+YA9/ug332BxWa6qMirMF3hN0U/7trP228o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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