Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cefb75ae9a874fba55dcb62f395a26933e2eef1bb776f6b0b3f53bd967b4bd7e' 
  AND token = '8c01kc+vw7RORoPXPb3vxULe/LD0K/LqCDy4noBQgdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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