Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd090392057c79fc9ac20a39061815a5fda29c51b7f4b2c3c6eecfd4aa27db0e9' 
  AND token = 'F/1MCuJ6QlAAqWkl18Kv9GjZ+R7BfdqbfoSfBxSov9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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