Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c85062400748d81c116e6c37362fa83c600b273cc2b0883b7fec2fbefa5d6e' 
  AND token = 'hdWxCwPDtRNDBCCWTiDFQ6Mw/Z5Awq4DBhVaC64KYbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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