Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7babd2dfacee3e862a249de0699c5fcad9999f76c1ec29a2c0626bf4efbefbe3' 
  AND token = 'XMKVxBZnxZIBQEK1w4jIuaFZYaQhn1VXGDslRbdzNdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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