Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c262cf6b3c152c29fd6eafe16bc4734590a0e0372c7d851bfb526737f6ebb75c' 
  AND token = 'qL2LX7ZJxRoT5099qGfW3fjXCqPy16dbgo+HMMTJQ8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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