Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc512e4dba254405114d645a9751143d3acbff715549beda09ad7709473419b3' 
  AND token = 'd8+VfwBuij/4R0puMD1KAlIPQGnPelS3RHBW4FdyVGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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