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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b2ce6c736128e900c6bc512cfead20a501583703d905563c74eff011add3889c' 
  AND token = '0rmtqTP+7eDlkY+3A9aQXyuzI6RuoR23ckWZm6UC2Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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