Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4aaa2ac9eff2836986631a843df0eafef800cee83a047c8035bd5cdf4138839' 
  AND token = 'Do4iyqCAbli8KW5avEoxgwOzyoHnyVMjrDJhRVZ+9j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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