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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6a9a42123bafa13bb11c2ca1283a746b005d47ccb7fe8897f2eefb998718670e' 
  AND token = 'PIwfzDL3BTyUrWXmNJr9IgkjB5AxNn706jaFwWScC+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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