Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33c06f2bbfdf04a46e5e48e3063a9648f7f8de791436c149ffa8337beeaa45f' 
  AND token = 'UaU8opDNTpfIqT9HmoDnNTiIcHbyq9o4WmaFqN5IgvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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