Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7b718ee793ae874a5fce41078143d1b2b2120cf5df6bbc06816f5846e49f77' 
  AND token = '6ajvwWOnrNxm/CPRUItll5FKrWvK5EKmCp2LtSIO6Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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