Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef939a2b2f27a0008725f029be9eec339b0437bc2306634ac5940c395ef0d0d3' 
  AND token = 'nuxpkdKCxzjD49h0gIizeBUMxq+mGY8sTOnQ6e1ctXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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