Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692a9897ee856d87e4a48f6d3e524fd09893d41e9cee1d9fb253d41fbad13c7d' 
  AND token = 'k81i8Q42XOkg6Fe3p006BFxeou96EpdVVzkEatmin58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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