Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6d3991d076d280c535b2deb02045ccf803a9d7f130a6b87e750ce0b9ae3a370' 
  AND token = 'W2UO7YGTW6FGpuhKueHPhrVPBWfS//teKeXLx0lbaGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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