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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '90713b4ff0d61978421a9288610f3d4daedba0d013cc3fe5f5d8134b0856bd1f' 
  AND token = '+d77c6GV7zo+P5itm9j8mP2EBGCDKAdkw+PfCkEBUR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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