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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '419f84e337aba4cdb4ecaa69d9244482dc892bea69464e2a2ad2e00008850777' 
  AND token = 'i8Y5k5iTO7MuknWb8TdHj2GBpILphZlotD35GAgC9dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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