Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e21c4f961eadd3215df95e7d03298f2de92d7a9759d1e937e072e8f0ce62c3d2' 
  AND token = 'vvLWLb2LNj1OohOAD0JdqRXCdAGtCW5Hth19AazutaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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