Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bbff55f338547c05dbb31822599f3c8d6c182479571b585e764a7fef24e6b4f' 
  AND token = 'LkPymPuYYBiCv43R335SAduarpS3WMjMFBxIwA6BgfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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