Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db758fff3438bc88c8d0e3f01e530adc14d416d81b775ce7c3011d4c8a33208' 
  AND token = 'YrToq9+wnKNitobHoX4ZyX7dqk9JB+Rde/Nu0YifWYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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