Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc39fb0f74c55a0b766938318e2b9feb78f4efec969b294d08a0015741ac4986' 
  AND token = 'mVkloqSy70fKpV6LorwZHoQYJOwFZYVDTtL8/ytFSa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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