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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8f613228a812b2e309fd32c75aa0b18f26d950486fd7d403cdc4a50cc43d042a' 
  AND token = 'lk/Ev2TJ61AxrW76x214oywHxGkvaa5TkWia6re5D7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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