Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a20a76cd63141fe686a48ce72020873ed896ffc09485d123f2a22eddf68ac8' 
  AND token = 'BI76Il4NW48L+A9PD9SqZLBCI7wDhmrZFkFRNtmZ0ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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