Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '748cd764c29f49832d1bdb29e197023b19f76f3f1fff75964b36ae464416774c' 
  AND token = '4BscmOkyWu4alxIHL0MwAfVn4rMX+dHLpOEeylwqMOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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