Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b40b5cbef7130e88d8759d578c9a31a87d3c021d649a96f377e851f8abad06a' 
  AND token = 'dqYo/vl+MxXTeRM7Z0Jh44rs1I8GlTXXd/lDakkrSwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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