Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0970203c35edd2ed10c7e3fca59ee805bf3b5dd1ed483e4affae3dc5e2b2a7' 
  AND token = '6SgPEKKA+2cw68mU57p31DWkZpwAH0KhuONAynDsbSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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