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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '396a6b5de2e1411a3c35ff75a7b8228f5e36a750ee67bf0dcfa5e6695526beec' 
  AND token = 'lZYtrpOR3FXIVb66wIminRUetHzHe9FTM7v5Bg/CaWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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