Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1986476ba82d3f4d9a160542f19952057d988235daa1639909f18e864d00796e' 
  AND token = '0LACnqn3OMkIxrJsk/alPScusbKPcClWtGUFBBeo3g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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