Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e4da6976921b86ff36c60711c1cdea44b2f2eefde73e7932d18c5e80df8f3a' 
  AND token = 'jhAdYvxaf9w8mSiN1ovKI/tmuiryGrhgX65Di7x61O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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