Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a81e43e1d820c50b620d38097ca183f9faef164e702e11bdedd5e877db236e73' 
  AND token = 'Pj9C60/BF0iLyAxhjRl+HTd4TsToGb6as4rlzcFAFTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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