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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '331e1a57b03b099b9b1b84c34acd2156ef6d7c0c7c13062b1076404fd9c8edfa' 
  AND token = 'CYkD/aJ7zubPtc3lkOBPTrxh1lAamEjZ114w9Peu7Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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