Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '187b0e6ce70ebd092693a53bea47a55f6c30f1c08b33988a5f752b603cfd97d5' 
  AND token = '+ub+eQZO7e9Exl8Is5k9oLkuJ7SljgUPfpRrcVJUvg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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