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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0cc669d4875831916170d2998b443f33996e6c6d6aef538051c4d1dee223fe2b' 
  AND token = 'QNhoNA5rEPM3ItDlV2QFH///ZeVLgZ41Y1QsvE5We9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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