Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bfed7404b2a317ed5a1b16f8ea4155ea5744d46c1f1f242e0de81374cc56f5b' 
  AND token = 'lEv8aQPBNkUfFkl39YFMzzeH/UmDMDWyJj55ZnrB5Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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