Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835ac49d0b69ec26612e004c34820146555b1ff250ed722d18047b4aee19267b' 
  AND token = 'NiUw1tbGUVmpEBYDVRbACnLrkmvHywBdw2oeCIguH14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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