Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4bddd1d7dc3c4691c07040a6cd751ce2124ebed5ce08050d5820ec2fea84583' 
  AND token = '4ErG8GRwPwuBrFPnGOjF/LAVfy8HklPZlUjX2sz7K+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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